Hamilton Sundstrand Corporation

Tom A Utecht

Craig R LeGros

Debabrata Pal

Michael C Harke

Kyle Stephen Ives

Craig R Legros

A system includes a generator. Three AC feeders are connected for feeding AC output from the generator. A rectifier is electrically connected to the three AC feeders and to a load via a first DC feeder and a second DC feeder. A first resistor connects between a first one of the DC feeders and ground. A first voltage sensor is operatively connected to detect voltage across the first resistor. A second resistor connects between the second DC feeder and ground. A second voltage sensor is operatively connected to detect voltage across the second resistor. A controller is configured to monitor for changes in common mode voltage based on the input from the first sensor and from the second sensor, and to determine presence of a fault if change in the common mode voltage exceeds a predetermined threshold.

Common mode voltage feed fault protection

A system includes a generator. Three AC feeders are connected for feeding AC output from the generator. A rectifier is electrically connected to the three AC feeders and to a load via a first DC feeder and a second DC feeder. A first resistor connects between a the first DC feeder and ground. A second resistor connects between the second DC feeder and ground. At least one of a first current sensor is operatively connected to detect current in the first DC feeder and/or a second current sensor is operatively connected to detect current in the second DC feeder. A controller is configured to monitor for changes in common mode current based on the input from the at least one current sensor, and to determine presence of a fault if change in the common mode current exceeds a predetermined threshold.

Common mode current feed fault protection

An thermal management system including, a body having a coolant passage in thermal communication with an electronic device, a first heat exchanger fluidically connected to the coolant passage configured to receive the coolant from the coolant passage, a second heat exchanger fluidically connected to the first heat exchanger, and a generator fluidically connected to the second heat exchanger.

Thermal management system and method of use

An aircraft engine thermal management system includes a body having a coolant passage in thermal communication with an electronic device, wherein the body and the electronic device are located in a first portion of the aircraft. A generator is fluidically connected by a coolant path to the coolant passage wherein the generator is located in a second portion of the aircraft, with at least a portion of the coolant path is located within a cooling location having a lower average temperature than either the first portion or the second portion of the aircraft.

A starter/generator arrangement includes a starter/generator, a power converter electrically connected to the starter/generator, and coolant circuit with a pump and a condenser in fluid communication with the power converter. The power converter is arranged to flow start mode electrical power in a first direction in a start mode and a second direction in a generate mode. The coolant circuit fluidly couples the pump to the condenser for storing heat in a coolant disposed within the coolant circuit while flowing the start mode electrical power in the first direction. Gas turbine engines and methods of cooling starter/generator arrangements are also described.

Starter/generator arrangements for gas turbine engines

An electrical power unit cooling system including at least one cooling fin configured to be thermally connected to a bus housing of the electrical power unit, the bus housing being configured to be attached to a surface of an aircraft fan housing such that the at least one cooling fin protrudes through the fan housing in order to be cooled by air flow within the fan housing.

Aircraft power electronic unit and method of cooling

A system including a variable frequency generator (VFG) including a generator configured to conduct alternating current to a first rectifier configured to convert alternating current from the VFG to direct current and drive it to an HVDC Bus Network, a variable frequency second generator including a second generator configured to conduct alternating current to a second rectifier configured to convert alternating current from the second generator to direct current and conduct it to the HVDC Bus Network, a speed correcting gearbox operatively connected to the VFG configured to align generator frequency to the second generator frequency, and a VFG control unit operatively connected to the generator configured to control the VFG, and a second generator control unit operatively connected to the second generator and the HVDC Bus Network configured to control the second generator.

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Cherry Valley, IL, United States of America

Tom A Utecht